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Get information about a user with a given name
#include <sys/types.h>
#include <shadow.h>
struct spwd* getspnam( char* name );
struct spwd* getspnam_r( const char* name,
struct spwd* result,
char* buffer,
size_t bufsize );
- name
- The name of the user.
- result
- (getspnam_r() only)
A pointer to a spwd structure where the function can
store the entry.
For more information about this structure, see
putspent().
- buffer
- (getspnam_r() only)
A block of memory that the function can use to allocate storage
referenced by the spwd structure.
You can determine the maximum size needed for this buffer by calling
sysconf()
with an argument of _SC_GETPW_R_SIZE_MAX.
- bufsize
- (getspnam_r() only)
The size of the block that buffer points to, in characters.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The getspnam() and getspnam_r() functions
allow a process to gain more knowledge about a user name.
The getspnam() function uses a static buffer that's overwritten by
each call.
A pointer to an object of type struct spwd
containing an entry from the group database with a matching name,
or NULL if an error occurred or the function couldn't find a
matching entry.
#include <stdio.h>
#include <stdlib.h>
#include <pwd.h>
#include <shadow.h>
/*
* Print information from the password entry
* about the user name given as argv[1].
*/
int main( int argc, char** argv )
{
struct spwd* sp;
if (argc < 2) {
printf("%s username \n", argv[0]);
return(EXIT_FAILURE);
}
if( ( sp = getspnam( argv[1] ) ) == (struct spwd*)0) {
fprintf( stderr, "getspnam: unknown %s\n",
argv[1] );
return( EXIT_FAILURE );
}
printf( "login name %s\n", sp->sp_namp );
printf( "password %s\n", sp->sp_pwdp );
return( EXIT_SUCCESS );
}
Unix
getspnam()
Safety: | |
Cancellation point |
Yes |
Interrupt handler |
No |
Signal handler |
No |
Thread |
No |
getspnam_r()
Safety: | |
Cancellation point |
Yes |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |
fgetspent(),
getlogin(),
getspent(),
getpwuid(),
putspent()
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